Ron Wald




Ron Wald is a nephrologist and Associate Professor of Medicine at the University of Toronto. A native of Montreal, he completed his undergraduate and medical degrees at McGill University and continued his clinical training in internal medicine and nephrology at the University of Toronto. Following this, he completed a Master in Public Health at Harvard University and a research fellowship at Tufts Medical Center in Boston. Since joining the St. Michael’s Hospital Division of Nephrology in 2006, Dr. Wald has been responsible for the hospital’s acute dialysis program. In addition to attending on the hospital’s Nephrology consult and ward services, he provides longitudinal care for patients on chronic hemodialysis and has an active general nephrology practice.

Dr. Wald’s research interests are in the areas of critical care nephrology and chronic dialysis. He is currently leading a Canadian Institutes of Health Research-funded international trial on the impact of the timing of dialysis initiation on survival in critically ill patients with acute kidney injury. He also has a strong interest in the long-term outcomes of patients who survive an episode of acute kidney injury and is co-leading a trial that is comparing specialized nephrology care vs usual care in this population. In the chronic dialysis area, Dr. Wald co-led a CIHR-funded study on the cardiovascular benefits of incentre nocturnal hemodialysis. He recently completed a multicentre pilot trial examining the implementation of two different levels of serum phosphate control in the hemodialysis population. A larger definitive trial to evaluate whether intensive serum phosphate lowering mediates improved clinical outcomes is planned. As a founding member of the Kidney Dialysis and Transplantation Program of the Institute for Clinical Evaluative Sciences, Dr. Wald is also involved in several studies that are using province-wide administrative data to answer research questions in kidney disease.

Please note: Dr. Wald is not taking any summer students.

Recent Publications

  1. Madan, S, Norman, PA, Wald, R, Neyra, JA, Meraz-Muñoz, A, Harel, Z et al.. Use of Guideline-Based Therapy for Diabetes, Coronary Artery Disease, and Chronic Kidney Disease After Acute Kidney Injury: A Retrospective Observational Study. Can J Kidney Health Dis. 2022;9 :20543581221103682. doi: 10.1177/20543581221103682. PubMed PMID:35721395 PubMed Central PMC9201307.
  2. Angriman, F, Ferreyro, BL, Angeloni, N, da Costa, BR, Wald, R, Bagshaw, SM et al.. The Effect of an Accelerated Renal Replacement Therapy Initiation Is Not Modified by Baseline Risk. Ann Am Thorac Soc. 2022; :. doi: 10.1513/AnnalsATS.202201-046RL. PubMed PMID:35587363 .
  3. Wald, R, Mertens, L. Hypoplastic Left Heart Syndrome Across the Lifespan: Clinical Considerations for Care of the Fetus, Child, and Adult. Can J Cardiol. 2022; :. doi: 10.1016/j.cjca.2022.04.028. PubMed PMID:35568266 .
  4. Lam, CZ, David, D, Acosta Izquierdo, L, Pezeshkpour, P, Dipchand, AI, Jean-St-Michel, E et al.. MRI Phase-Contrast Blood Flow in Fasting Pediatric Patients with Fontan Circulation Correlates with Exercise Capacity. Radiol Cardiothorac Imaging. 2022;4 (2):e210303. doi: 10.1148/ryct.210303. PubMed PMID:35506132 PubMed Central PMC9059244.
  5. Fronza, M, Thavendiranathan, P, Karur, GR, Abdel-Qadir, H, Udell, JA, Wald, RM et al.. Cardiac MRI and Clinical Follow-up in COVID-19 Vaccine-associated Myocarditis. Radiology. 2022; :220802. doi: 10.1148/radiol.220802. PubMed PMID:35503017 PubMed Central PMC9096714.
  6. Thompson Bastin, ML, Stromberg, AJ, Nerusu, SN, Liu, LJ, Mayer, KP, Liu, KD et al.. Association of Phosphate-Containing versus Phosphate-Free Solutions on Ventilator Days in Patients Requiring Continuous Kidney Replacement Therapy. Clin J Am Soc Nephrol. 2022; :. doi: 10.2215/CJN.12410921. PubMed PMID:35477673 .
  7. Marelli, A, Beauchesne, L, Colman, J, Ducas, R, Grewal, J, Keir, M et al.. Canadian Cardiovascular Society 2022 Guidelines for Cardiovascular Interventions in Adults With Congenital Heart Disease. Can J Cardiol. 2022; :. doi: 10.1016/j.cjca.2022.03.021. PubMed PMID:35460862 .
  8. Kitchlu, A, Reid, J, Jeyakumar, N, Dixon, SN, Munoz, AM, Silver, SA et al.. Cancer Risk and Mortality in Patients With Kidney Disease: A Population-Based Cohort Study. Am J Kidney Dis. 2022; :. doi: 10.1053/j.ajkd.2022.02.020. PubMed PMID:35405208 .
  9. Meraz-Muñoz, AY, Weinstein, J, Wald, R. eGFR Decline after SGLT2 Inhibitor Initiation: The Tortoise and the Hare Reimagined. Kidney360. 2021;2 (6):1042-1047. doi: 10.34067/KID.0001172021. PubMed PMID:35373074 PubMed Central PMC8791377.
  10. Meier, N, Nägler, T, Wald, R, Schmidt, A. Purchasing behavior and use of digital sports offers by CrossFit® and weightlifting athletes during the first SARS-CoV-2 lockdown in Germany. BMC Sports Sci Med Rehabil. 2022;14 (1):44. doi: 10.1186/s13102-022-00436-y. PubMed PMID:35321735 PubMed Central PMC8940977.
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Affiliations & Other Activities

  • Nephrologist, Department of Medicine, St. Michael’s Hospital
  • Associate Professor, Department of Medicine, University of Toronto